Celebrations, you’ve gotten it done at last! 
Happy New Z!! 
I have to side with those wishing for a permanent serial. I know piracy is a huge problem for developers, artists, etc., but anything is better than a temporary solution. I learned graphics on an Amiga (don’t laugh, it’s got a 200mHz PPC, 80MB RAM etc.) and once of the programs I was most excited by was called Tornado3D by an Italian comapny called Eyelight. They were very concerned by piracy, as well they should have been given the nature and size of the Amiga market. Their initial solution was to require a dongle for the software to run. Two versions later they added a user specific key generator and requested the key disk be mailed back to them. It wasn’t a hopeless procedure though it was a bit flaky and many users had a hard time getting it to work on their configurations. 6 months later, Eyelight disappeared without a trace, never to be heard from again. So while it’s possible to run nearly any other Amiga 3D app under emulation, or even on one of the newer PPC systems (AmigaOne/Pegasos), there is no way to use T3D on any machine other than an Amiga originally supported by the dongle/keyfile combo. I certainly don’t expect Pixologic to go away, nor do I expect to be without the internet anytime soon. However if either of these things were to happen, I’d be a legal user of zBrush and yet unable to use it perhaps ever again. Who’d among us could stand that?
Version 1.55b users can send in for a permanent serial number. In addition, the time sensitivity experienced by many users with previous versions has been eliminated. Finally, should something ever happen to Pixologic, we would not leave our customers high and dry.
So there is no need for concern, either now or in the future!
With version 1.55, we recommend that you first run ZBrush for a few days to make sure that there were no hidden problems with your download. Once you are satisfied that the program is performing as expected, follow the instructions in Serial_Number.txt to send in for your permanent serial number.
Happy ZBrushing!
Fantastic job!! I’ve played around alot today and I can see I’m very behind the learning curve. LOL I’m really going to enjoy catching up tho when possible!
Thanks so much to the whole pixologic team for all your hard work!!
Wenna don’t worry if you have any trouble, just ask! There are plenty of people here to help you!
Thanks a lot, Pixologic team members and all you helpful wizards out there! A new era of exploring has just started!
Kindest regards from Switzerland!
Marco
Just yesterday I determined its well time I got to grips with Zbrush as more than merely a way to do poser morphs ( v. pathetic, I know ) went to the Zbrush forum at R’osity to have a nosey and found the links for… a new version and manual -it must be a SIGN !! Thanks very much !!! No turning back now
Any way to get this version now? I would like to see it and play with it 
No. Because every release of ZBrush has been a free upgrade for anyone who ever purchased a license, Pixologic does not sell or release outdated versions. Plus, it would be a support nightmare.
4R7 has all the features of 1.55b, but better. And more.
thanks for the answer! it’s a pity 
Hi,
why do you want to play with a very, very, very old ZBrush version from 2003?
If you don’t own the current ZBrush version then you can download and use the trail version of the current ZBrush version
Link: https://pixologic.com/zbrush/trial/
just to see how it started. which tools were available. how it worked and stuff.
Hi,
maybe the Feature Tour from year 2003 could be a little bit helpful: https://web.archive.org/web/20030208124154/http://pixologic.com/
BTW: I don’t believe that you can order the 1.5 Demo version via this old page 
thanks for the link.
maybe. but where should I ask about Zbrush if not at Pixologic site?